Anti-cracking construction method for side wall structure of underground rail transportation

Abstract

The invention discloses an anti-cracking construction method for a side wall structure of underground rail transportation. The construction method comprises the following steps of preparation of construction: providing structures and equipment required in the construction process; bundling bottom plate reinforcing steel bars and guide wall reinforcing steel bars, installing a bottom plate formworkand a guide wall formwork, and pre-embedding bottom plate air ventilating pipes; bundling side wall reinforcing steel bars, installing a side wall formwork, and pre-embedding side wall air ventilating pipes; preparing concrete; casting bottom plate concrete; casting side wall concrete, introducing cold air into the side wall air ventilating pipes in the casting process, and introducing hot air into the bottom plate air ventilating pipes; constructing a top plate. The construction method has the beneficial effects that by reserving the air ventilating pipes in the bottom plate formwork and theside wall formwork, the cold air is introduced into the side wall air ventilating pipes while the side wall concrete is cast, so as to reduce the temperature of the side wall concrete after enteringthe formwork, which is equivalent to the reduction of formwork-entering temperature of the concrete; especially, before the concrete is finally set, the heat conduction coefficient is large, so that the temperature reduction effect on the concrete is obvious, and the forming of cracks can be effectively prevented.

Description

technical field [0001] The invention relates to the technical field of underground structure construction, in particular to an anti-crack construction method for an underground rail transit side wall structure. Background technique [0002] The cracking of the concrete of the side wall structure of underground rail transit is very common in the solid engineering structure, and it is also a very difficult problem to solve and overcome in the field of concrete engineering. The cracking form of side wall structural concrete is dominated by temperature cracks, mainly because during the process of concrete temperature drop, the side wall structural concrete is strongly restrained by the bottom plate and guide wall structural concrete of the previous part, resulting in shrinkage and cracking. [0003] At present, the methods to reduce the temperature cracks of the underground side wall mainly include the additive method and the physical cooling method. Among them, the additive met...

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Problems solved by technology

[0004] The object of the present invention is to, aiming at the deficiencies of the prior art, provide a kind of anti-crack construction method for the side wall structure of underground rail transit, which combines materials and construction technology to solve the problem of the structural constraints of the side wall structure concrete due to the prior pouring and the concrete itself. Cracking problems caused by shrinkage deformation

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